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Custom Injection Molding

What is Plastic Injection Molding

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Definition of Injection Molding

Injection molding is a manufacturing process in which plastic materials are heated and melted, then injected into a mold through an injection molding machine and cooled to shape. The process includes the steps of heating, injecting, cooling, and demolding, and is capable of producing complex shaped plastic products quickly and efficiently.

The Importance of Injection Molding in Manufacturing

Efficient Production

Injection molding is capable of producing complex shapes and precise sizes of plastic products in large quantities in a short period of time, which greatly improves production efficiency.

Cost Effectiveness

Products manufactured through injection molding are of high consistency and quality, reducing the rate of defective products and lowering production costs. In addition, the multiple use of molds greatly reduces the production cost of a single product.

Wide choice of materials

Injection molding can use a variety of different types of plastic materials, including thermoplastics and thermosets, to meet the needs of different products.
Design Flexibility


Design Flexibility

A wide range of complex geometries can be produced through injection molding, which provides great flexibility in product design, enabling many designs that would be difficult to achieve through traditional manufacturing methods.

Wide range of applications

Injection molding is widely used in many industries such as automotive, electronics, electrical appliances, medical devices, packaging, etc., and is an integral part of modern manufacturing.

Fundamentals of Custom Injection Molding

Injection molding is a process in which plastic materials are heated and melted, then cooled and molded by injecting them into a mold under high pressure. This process allows for the production of plastic products of various complex shapes and precise sizes.

Basic steps in injection molding: from material to finished product

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Charging:Plastic granules or powdered material are fed into the hopper of an injection molding machine.

Heating and melting:The plastic material in the hopper is conveyed to a heated cylinder where it is melted into a fluid state by means of a heater.

Injection:The melted plastic is injected into a pre-designed mold by means of a screw or plunger under high pressure.

Cooling Molding:The plastic injected into the mold is cooled and solidified in the mold to form the desired shape.

Demolding:The mold opens and the finished product is ejected and removed.

Machines and molds play a crucial role in the manufacturing industry. Firstly, machines are the backbone of the production process, enhancing efficiency and product quality through automation and precise control. They can perform a variety of complex tasks, from simple assembly to high-precision machining, significantly reducing the need for manual labor and minimizing operational errors.

Secondly, molds are essential tools for creating specific shapes and sizes. Whether in injection molding, stamping, or casting processes, molds determine the accuracy and consistency of the final product. High-quality molds ensure that every product meets design specifications, reducing waste and subsequent processing costs.

The combination of machines and molds enables mass production while maintaining high levels of precision and consistency. This not only boosts production efficiency but also ensures the quality and reliability of products. Therefore, machines and molds are indispensable in modern manufacturing, driving industry growth and innovation.

The role of machines and molds

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Commonly Used Injection Molding Materials

Properties: Lightweight, chemical resistant, and flexible.

Applications: Packaging, automotive parts, and consumer goods.

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Properties: Strong, impact-resistant, and easy to mold.

Applications: Automotive components, electronics housings, and toys.

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Properties: High impact resistance, transparent, and heat resistant.

Applications: Lenses, safety helmets, and medical devices

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Properties: High strength, wear-resistant, and good chemical resistance.

Applications: Gears, bearings, and mechanical components.

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Properties: Excellent chemical resistance, flexible, and moisture resistant.

Applications: Containers, pipes, and household goods.

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Properties: Strong, transparent, and good barrier properties.

Applications: Bottles, food containers, and textile fibers.

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Key Elements of Custom Injection Molding

Design and Engineering

  • Part Design: The design of the part should consider functionality, manufacturability, and cost-efficiency. Factors like wall thickness, draft angles, and rib design are crucial for successful molding.
  • Mold Design: The mold must be designed to accommodate the part’s specifications, including gating, venting, and cooling channels. Proper mold design ensures uniform filling, cooling, and ejection of parts.

Material Selection

  • Material Properties: Choose materials based on the mechanical, thermal, and chemical properties required for the application. Common materials include ABS, PC, PP, and nylon.
  • Compatibility: Ensure the chosen material is compatible with the mold design and the intended use of the final product.

Mold Fabrication

  • Tooling: High-precision tooling is essential for producing accurate and consistent parts. This involves machining processes like CNC milling, EDM, and grinding.
  • Durability: The mold should be made from durable materials such as hardened steel or aluminum, depending on the production volume and material being molded.

Process Parameters

  • Injection Pressure and Speed: These parameters must be optimized to ensure proper filling of the mold without causing defects like flash or short shots.
  • Temperature Control: Maintaining precise temperatures in the mold, barrel, and nozzle is crucial for consistent part quality and cycle times.
  • Cooling Time: Efficient cooling is necessary to solidify the part properly and reduce cycle times, impacting overall production efficiency.

Quality Control

  • Inspection: Implement rigorous inspection processes using tools like coordinate measuring machines (CMMs), optical scanners, and visual inspection to ensure parts meet specifications.
  • Testing: Perform mechanical, thermal, and chemical tests to verify the material properties and part performance.

roduction Efficiency

  • Cycle Time: Optimize cycle times by balancing injection, cooling, and ejection phases to maximize productivity while maintaining part quality.
  • Automation: Utilize automation for tasks such as part removal, assembly, and packaging to enhance efficiency and reduce labor costs.
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Cost Management

  • Material Costs: Choose cost-effective materials that meet the required specifications.
  • Tooling Costs: Balance initial tooling investment with the expected production volume to achieve cost-efficiency over the product’s lifecycle.
  • Operational Costs: Monitor and manage energy consumption, labor, and maintenance costs to keep overall production expenses in check.


  • Trimming and Deburring: Remove excess material from parts to achieve the desired finish.
  • Surface Treatment: Apply coatings, painting, or other surface treatments as needed for aesthetic or functional purposes.
  • Assembly: Integrate molded parts into assemblies, ensuring compatibility and performance.

Advantages of choosing us for custom injection molding

When selecting a partner for custom injection molding, it’s essential to find a company that offers high quality, cost-effectiveness, and flexibility. Here are the key advantages of choosing our custom injection molding services:

Exceptional Design and Engineering Support

Our team of experienced designers and engineers provides comprehensive support tailored to your needs, from initial concept to final product. Using advanced design software and tools, we optimize product designs to ensure functionality and manufacturability while reducing production costs.

Wide Range of Material Options

We offer a wide variety of material options, including ABS, PC, PP, and nylon, ensuring you can select the best material for your specific application. Our material experts can help you choose the right material based on mechanical, thermal, and chemical properties to meet your product’s requirements.

High-Quality Mold Fabrication

We utilize state-of-the-art machining processes such as CNC milling and EDM to create high-precision molds, ensuring accurate and consistent parts. Our molds are made from durable materials like hardened steel or aluminum, depending on the production volume and material being molded, ensuring long-lasting performance.

Optimized Process Parameters

We maintain precise control over injection pressure, speed, and temperature to ensure consistent part quality and minimize defects. Our advanced cooling systems reduce cycle times and enhance production efficiency without compromising part quality.

Rigorous Quality Control

We implement rigorous inspection processes using tools like CMMs, optical scanners, and visual inspection to ensure parts meet exact specifications. We also perform mechanical, thermal, and chemical tests to verify material properties and part performance, ensuring the highest quality standards.

Production Efficiency

By balancing injection, cooling, and ejection phases, we maximize productivity while maintaining high-quality standards. We also utilize automation for tasks such as part removal, assembly, and packaging, enhancing efficiency and reducing labor costs.

Cost Management

We help you choose cost-effective materials that meet your required specifications, balancing quality and budget. We balance initial tooling investment with expected production volume, ensuring cost-efficiency throughout the product lifecycle. Additionally, we monitor and manage energy consumption, labor, and maintenance costs, keeping overall production expenses in check.

Comprehensive Post-Processing

We provide trimming, deburring, and surface treatments to achieve the desired finish and functionality of your parts. We also offer assembly services to integrate molded parts into final products, ensuring compatibility and performance.